EP1301971A4 - Storage network cabling verification system - Google Patents
Storage network cabling verification systemInfo
- Publication number
- EP1301971A4 EP1301971A4 EP01927039A EP01927039A EP1301971A4 EP 1301971 A4 EP1301971 A4 EP 1301971A4 EP 01927039 A EP01927039 A EP 01927039A EP 01927039 A EP01927039 A EP 01927039A EP 1301971 A4 EP1301971 A4 EP 1301971A4
- Authority
- EP
- European Patent Office
- Prior art keywords
- controller
- port names
- controllers
- devices
- port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
- G06F11/0706—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation the processing taking place on a specific hardware platform or in a specific software environment
- G06F11/0727—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation the processing taking place on a specific hardware platform or in a specific software environment in a storage system, e.g. in a DASD or network based storage system
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
- G06F11/2053—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where persistent mass storage functionality or persistent mass storage control functionality is redundant
- G06F11/2056—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where persistent mass storage functionality or persistent mass storage control functionality is redundant by mirroring
- G06F11/2071—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where persistent mass storage functionality or persistent mass storage control functionality is redundant by mirroring using a plurality of controllers
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
- G06F11/0751—Error or fault detection not based on redundancy
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0673—Single storage device
Definitions
- each controller is coupled to a number of hubs.
- Each of the hubs may be connected to up to four disk drive enclosures.
- Each enclosure can include as many as twelve disk drives. Since both controllers need to connect to the same disk drives, the hubs must connect to the same enclosures, thus multiple connections are required. Because the significant amount of cabling involved, there is the possibility for cabling errors in connecting the disk drives.
- each enclosure of twelve disk drives will have one or two disk drives that include SCSI enclosure services (SES). This capability essentially allows the SES device to poll the other devices in the enclosure to determine their identities and slot assignments, as well as other configuration data.
- SES SCSI enclosure services
- the present invention provides a method and apparatus for dete ⁇ riining proper cabling and identical device locations between two controllers in a RALD system.
- Each controller first obtains the port names of the devices to which it is attached. The list is then reviewed to determine that there are no duplicate entries. Once this step is completed, the controllers exchange their port name lists. The lists are compared to make sure they exactly match. Finally, the controllers exchange a map of the devices themselves present on two channels connected to the ports. The exchange device maps are compared and must be equal. The two device maps being equal indicate that each storage device is logged on to the network through both I/O ports and is available to each controller.
- the port names in the first steps are the ports of at least one, and preferably two, SES polling devices in each disk drive enclosure.
- the SES polling devices themselves determine the identity of the devices in their enclosures, and pass this along to the controllers.
- Fig. 1 illustrates an enclosure of disk drives used in the invention.
- Fig. 2 is a block diagram illustrating the connection of multiple disk drives to two controllers.
- Fig. 3 is a block diagram of the two controllers of Fig. 2.
- Fig. 4 is a diagram illustrating the cabling of disk arrays through hubs according to an embodiment of the invention.
- Figs. 5A-5B are a flowchart illustrating the operation of a preferred embodiment of the invention.
- Fig 1. illustrates an enclosure 100 having 12 disk drives mounted in slots in the enclosure.
- a disk drive 102 and a disk drive 104 support the SCSI enclosure services (SES) protocol. These two disk drives are attached to two loops which connects them to the other disk drives in enclosure 100.
- SES SCSI enclosure services
- Fig. 2 is a diagram illustrating the connection of two controllers (210, 212) to the same disk drives (214). The portion of each controller shown is the fibre channel port interface to the fibre channel cable attached to an enclosure port.
- each circular diagram represents an enclosure (211, 213), which contains 12 disk drives.
- the drives have dual fibre channel ports, represented by the inner (216) and outer (218) circles.
- the drive addresses in each enclosure are assigned by the enclosure and are based on the setting of a range switch within the enclosure.
- the range switch settings for all enclosures on an individual fibre channel loop are unique to ensure unique drive addresses on the loop.
- Fig. 3 is a block diagram of one embodiment of the controllers 210 and 212 of Fig. 2.
- FC Fibre Channel
- RALD RALD interfaces 32 over PCI busses 20. Data is staged in-between them in a buffer memory 22. Shadow buffer memories 24 are provided for redundancy.
- a RAID engine controller 50 is used for generating RAID functions.
- Microprocessor 14 performs program operations, and then the particular operation codes are transmitted across PCI bus 20 through PLX interface 52 to controller 50.
- Fig. 4 illustrates a typical cabling system used in the present invention.
- Controllers 210 and 212 each have two ports or channels, port 0 and port 1. As shown in Fig. 4, port 0 of controller 210 is connected to a hub 400, while port 1 is connected to a hub 402. Hub 400 is in turn connected to four disk array enclosures 404, 406, 408, and 410. Hub 402 would be similarly connected to another four enclosures (not shown).
- the controller uses fibre channel, and there are 12 drives in each enclosure. Through the use of two hubs, up to eight enclosures can be attached to each controller for a total of 96 disk drives. Each disk drive has dual input/output ports. This allows connection also to a second controller 212, through a hub 412, for example.
- each enclosures features an 8-position switch that must be set during installation. This switch controls the device address assigned to each device. Installation errors may occur when setting switches and cabling the enclosures, hubs and controllers. In addition, it is necessary that the dual port feature of the disk drives be functional. The correctness of the cabling and operation of the device dual port feature is of primary importance for proper network operation. Cabling errors can enable a device to be "present" as more than one device to a single controller. Also, devices assigned an address by one controller may be assigned an unrelated address by the partner controller or not known at all. Should the partner controller fail, for the surviving controller to assume the work of the controller pair, both controllers must have assigned each device to the same address (physical address) in the network. Cabling Verification
- firmware in the controller performs a procedure to verify that the cabling from the controller boards to the enclosures is correctly installed. Consistent device logging on the network is also verified. The procedure relies on the fact that each drive has a unique factory-assigned "port name" which is available to the firmware.
- Each enclosure contains two drives that support the SES protocol. The SES devices are chosen, and the system is inherently aware of the enclosure in which they reside.
- the procedure has the following steps, shown in Fig. 5A-5B.
- the port names of selected devices are obtained (Step 504).
- these are the port names of the two SES polling devices in each enclosure.
- a list is then created in I/O channel enclosure switch order. The list is then examined to ensure that each port name occurs only once in the list (Step 506). If there are any duplicate entries (Step 508) the network verification fails (Step 510). For this process to be successful in the preferred embodiment, there must be at least one SES device installed in each enclosure.
- the controllers exchange their port name list. This is accomplished by each controller requesting the port map from its peer (Step 512) and waiting until that peer port map has arrived (Step 514).
- the map is received, the local and peer controller device maps are compared (Step 516).
- the lists must be equal, in other words have the same number of entries and the entries must be equal and in the same order (Step 518). If they are not, the network verification fails (Step 520).
- the devices themselves are compared.
- the controllers exchange a map of devices by first requesting the peer map device (Step 522) and then waiting until the peer map device map is received (Step 524).
- the invention thus allows faster device availability after a fail-over. This is significant since some systems have a time-out, and require manual intervention, if the devices don't become available within a time-out period.
- the present invention may be embodied in other specific forms without departing from the essential characteristics thereof.
- devices other than a SES protocol devices could be chosen to monitor devices in the configuration. These devices are not restricted to FC- AL type devices. Alternately, the comparisons could be done in a separate maintenance or host processor, rather than the redundant controller.
- the invention can also be used with any number of N controllers and M devices.
- the devices could be connected by other than a FC-AL, such as by a SCSI interface. Accordingly, the foregoing description is intended to be illustrative, but not limiting, of the scope of the invention which is set forth in the following claims.
Abstract
A method and apparatus for determining the proper cabling and identical device locations between two controllers (210, 212) in a RAID system. Each controller first obtains the port names to which it is attached. The list is then reviewed to determine that there are no duplicate entries. Once this step is completed, the controllers exchange their port name lists. The lists are compared to make sure they exactly match. Finally, the controllers exchange a map of the devices themselves present on two channels. The exchange device maps are compared and must be equal. The two device maps being equal indicate that each storage device is logged on to the network through both I/O ports and is available to each controller.
Description
STORAGE NETWORK CABLING VERIFICATION SYSTEM
BACKGROUND OF THE INVENTION The present invention relates to redundant arrays of independent disks
(RAID), and in particular to mechanisms for cabling two controllers to the same disk drives.
In RAID systems, often two different controllers are each connected to the same group of disk drives for redundancy. In a typical configuration, each controller is coupled to a number of hubs. Each of the hubs may be connected to up to four disk drive enclosures. Each enclosure can include as many as twelve disk drives. Since both controllers need to connect to the same disk drives, the hubs must connect to the same enclosures, thus multiple connections are required. Because the significant amount of cabling involved, there is the possibility for cabling errors in connecting the disk drives. In a typical configuration, each enclosure of twelve disk drives will have one or two disk drives that include SCSI enclosure services (SES). This capability essentially allows the SES device to poll the other devices in the enclosure to determine their identities and slot assignments, as well as other configuration data.
It would be desirable to be able to automatically determine that the cabling is correct such that each of two redundant controllers identifies the same disk drives in the same locations to facilitate a smooth transition of control from one controller to the other.
SUMMARY OF THE INVENTION The present invention provides a method and apparatus for deteπriining proper cabling and identical device locations between two controllers in a RALD system. Each controller first obtains the port names of the devices to which it is attached. The list is then reviewed to determine that there are no duplicate entries. Once this step is completed, the controllers exchange their port name lists. The lists are compared to make sure they exactly match. Finally, the controllers exchange a map of the devices themselves present on two channels connected to the ports. The exchange device maps are compared and must be equal. The two device maps being equal indicate that each storage device is logged on to the network through both I/O ports and is available to each controller.
In a preferred embodiment, the port names in the first steps are the ports of at least one, and preferably two, SES polling devices in each disk drive enclosure. The SES polling devices themselves determine the identity of the devices in their enclosures, and pass this along to the controllers. For a further understanding of the nature and advantages of the invention, reference should be made to the following description taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 illustrates an enclosure of disk drives used in the invention.
Fig. 2 is a block diagram illustrating the connection of multiple disk drives to two controllers.
Fig. 3 is a block diagram of the two controllers of Fig. 2. Fig. 4 is a diagram illustrating the cabling of disk arrays through hubs according to an embodiment of the invention.
Figs. 5A-5B are a flowchart illustrating the operation of a preferred embodiment of the invention.
DESCRIPTION OF THE SPECIFIC EMBODIMENTS Enclosure
Fig 1. illustrates an enclosure 100 having 12 disk drives mounted in slots in the enclosure. In one embodiment, a disk drive 102 and a disk drive 104 support the SCSI enclosure services (SES) protocol. These two disk drives are attached to two loops which connects them to the other disk drives in enclosure 100. Dual Controller Connections to Drives
Fig. 2 is a diagram illustrating the connection of two controllers (210, 212) to the same disk drives (214). The portion of each controller shown is the fibre channel port interface to the fibre channel cable attached to an enclosure port. In one embodiment, each circular diagram represents an enclosure (211, 213), which contains 12 disk drives. The drives have dual fibre channel ports, represented by the inner (216) and outer (218) circles.
The drive addresses in each enclosure are assigned by the enclosure and are based on the setting of a range switch within the enclosure. The range switch settings
for all enclosures on an individual fibre channel loop are unique to ensure unique drive addresses on the loop.
Controller Block Diagram .
Fig. 3 is a block diagram of one embodiment of the controllers 210 and 212 of Fig. 2.
As can be seen, data flow is provided through two different host Fibre Channel (FC) interfaces 30 to the disk drives 214. Each host interface 30 communicates with two RALD interfaces 32 over PCI busses 20. Data is staged in-between them in a buffer memory 22. Shadow buffer memories 24 are provided for redundancy. A RAID engine controller 50 is used for generating RAID functions.
Microprocessor 14 performs program operations, and then the particular operation codes are transmitted across PCI bus 20 through PLX interface 52 to controller 50.
Cabling System
Fig. 4 illustrates a typical cabling system used in the present invention. Controllers 210 and 212 each have two ports or channels, port 0 and port 1. As shown in Fig. 4, port 0 of controller 210 is connected to a hub 400, while port 1 is connected to a hub 402. Hub 400 is in turn connected to four disk array enclosures 404, 406, 408, and 410. Hub 402 would be similarly connected to another four enclosures (not shown).
In one embodiment, the controller uses fibre channel, and there are 12 drives in each enclosure. Through the use of two hubs, up to eight enclosures can be attached to each controller for a total of 96 disk drives. Each disk drive has dual input/output ports. This allows connection also to a second controller 212, through a hub 412, for example.
The connection of eight enclosures to two controller boards requires 20 fibre channel cables and four fibre channel hubs. In addition, each enclosures features an 8-position switch that must be set during installation. This switch controls the device address assigned to each device. Installation errors may occur when setting switches and cabling the enclosures, hubs and controllers. In addition, it is necessary that the dual port feature of the disk drives be functional. The correctness of the cabling and operation of the device dual port feature is of primary importance for proper network operation. Cabling errors can enable a device to be "present" as more than one device to a single controller. Also, devices assigned an address by one controller may be assigned an unrelated address by the partner controller or not known at all. Should the partner controller fail, for the surviving
controller to assume the work of the controller pair, both controllers must have assigned each device to the same address (physical address) in the network. Cabling Verification
During the bootup process, firmware in the controller performs a procedure to verify that the cabling from the controller boards to the enclosures is correctly installed. Consistent device logging on the network is also verified. The procedure relies on the fact that each drive has a unique factory-assigned "port name" which is available to the firmware. Each enclosure contains two drives that support the SES protocol. The SES devices are chosen, and the system is inherently aware of the enclosure in which they reside.
The procedure has the following steps, shown in Fig. 5A-5B. First, it is verified that both fibre channel loops are up and operating (Step 502). Next, the port names of selected devices are obtained (Step 504). Preferably, these are the port names of the two SES polling devices in each enclosure. A list is then created in I/O channel enclosure switch order. The list is then examined to ensure that each port name occurs only once in the list (Step 506). If there are any duplicate entries (Step 508) the network verification fails (Step 510). For this process to be successful in the preferred embodiment, there must be at least one SES device installed in each enclosure.
Next, the controllers exchange their port name list. This is accomplished by each controller requesting the port map from its peer (Step 512) and waiting until that peer port map has arrived (Step 514). When the map is received, the local and peer controller device maps are compared (Step 516). The lists must be equal, in other words have the same number of entries and the entries must be equal and in the same order (Step 518). If they are not, the network verification fails (Step 520). After the port map test, the devices themselves are compared. The controllers exchange a map of devices by first requesting the peer map device (Step 522) and then waiting until the peer map device map is received (Step 524). If the local and peer device maps are not equal (Step 526), there is again a network verification failure (Step 528). If the maps are equal, the network is verified as correct (Step 530). The two device maps being equivalent indicates that each storage device is logged onto the network through both I O ports and is available to each controller, with each controller having the same location indicated for the same device.
In the SES protocol, device presence is sensed by accessing the status code nibbles in each element status field for each device slot. The device present is shown by
the status code "01H". Other status codes could show that it is unrecoverable, not installed or not available. Not available is set after enclosure power-on reset prior to updating this element. For FC-AL devices, the target address for a particular slot position can be sensed by accessing the "slot address" field within a device element. Further details of the SES operation can be obtained from the SCSI-3 Enclosure Services Command Set Specification, such as Rev 8a, dated January 16, 1997, a working draft proposed by the American National Standard for Information Systems (dpANS X3.xxx- 1997 X3T10 Project 1212-D Rev 8a).
The invention thus allows faster device availability after a fail-over. This is significant since some systems have a time-out, and require manual intervention, if the devices don't become available within a time-out period.
As will be understood by those of skill in the art, the present invention may be embodied in other specific forms without departing from the essential characteristics thereof. For example, devices other than a SES protocol devices could be chosen to monitor devices in the configuration. These devices are not restricted to FC- AL type devices. Alternately, the comparisons could be done in a separate maintenance or host processor, rather than the redundant controller. The invention can also be used with any number of N controllers and M devices. The devices could be connected by other than a FC-AL, such as by a SCSI interface. Accordingly, the foregoing description is intended to be illustrative, but not limiting, of the scope of the invention which is set forth in the following claims.
Claims
WHAT IS CLAIMED IS:
1. In a RAID system having first and second, redundant RAID controllers, each cabled to the same plurality of memory devices, a method for verifying proper cabling, comprising: obtaining, in said first RAJ-D controller, a first plurality of port names; reviewing said first plurality of port names for duplicate entries; indicating a failure if there are any duplicate entries in said first plurality of port names; obtaining, in said second RAID controller, a second plurality of port names; reviewing said second plurality of port names for duplicate entries; indicating a failure if there are any duplicate entries in said second plurality of port names; comparing said first and second plurality of port names; indicating a failure if said first and second plurality of port names do not exactly match; obtaining, in said first controller, a map of devices connected to said first controller; obtaining, in said second controller, a map of devices connected to said second controller; comparing said first and second device maps; and indicating a failure if said first and second device maps do not exactly match.
2. The method of claim 1 wherein said comparings are performed in each of said first and second controllers.
3. The method of claim 1 wherein said port names comprise a subset of a group of devices, each of said port names corresponding to a port coupled to a remainder of said group of devices.
4. The method of claim 3 wherein said port names correspond to SES devices.
5. The method of claim 4 wherein at least one SES device is mounted in each of a plurality of device enclosures.
6. The method of claim 4 wherein each said SES devices shares an enclosure with a plurality of disk drives in a plurality of slots of said enclosure, and each said SES devices polls said plurality of disk drives in said enclosure to determine a device identity in each slot.
7. The method of claim 1 wherein said devices are disk drives.
8. The method of claim 1 wherein there are N controllers and M devices.
9. The method of claim 1 wherein said comparings are performed in a maintenance or host processor.
10. In a RAJ-D system having first and second, redundant R-ALD controllers, each cabled to the same plurality of memory devices, a method for verifying proper cabling, comprising: obtaining, in said first RAJ-D controller, a first plurality of port names; reviewing said first plurality of port names for duplicate entries; indicating a failure if there are any duplicate entries in said first plurality of port names; obtaining, in said second RAJ-D controller, a second plurality of port names; reviewing said second plurality of port names for duplicate entries; indicating a failure if there are any duplicate entries in said second plurality of port names; exchanging, between said first and second controllers, said first and second plurality of port names; comparing, in at least one of said first and second controllers, said first and second plurality of port names; indicating a failure if said first and second plurality of port names do not exactly match; obtaining, in said first controller, a map of devices connected to said first controller;
obtaining, in said second controller, a map of devices connected to said second controller; exchanging, between said first and second controllers, said first and second device maps; comparing, in at least one of said first and second controllers, said first and second device maps; and mdicating a failure if said first and second device maps do not exactly match.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/578,830 US6351831B1 (en) | 2000-05-24 | 2000-05-24 | Storage network cabling verification system |
US578830 | 2000-05-24 | ||
PCT/US2001/012297 WO2001091263A1 (en) | 2000-05-24 | 2001-04-16 | Storage network cabling verification system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1301971A1 EP1301971A1 (en) | 2003-04-16 |
EP1301971A4 true EP1301971A4 (en) | 2005-10-12 |
Family
ID=24314496
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01927039A Withdrawn EP1301971A4 (en) | 2000-05-24 | 2001-04-16 | Storage network cabling verification system |
Country Status (4)
Country | Link |
---|---|
US (1) | US6351831B1 (en) |
EP (1) | EP1301971A4 (en) |
CA (1) | CA2409925A1 (en) |
WO (1) | WO2001091263A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6654830B1 (en) * | 1999-03-25 | 2003-11-25 | Dell Products L.P. | Method and system for managing data migration for a storage system |
IES20010396A2 (en) * | 2000-07-06 | 2002-02-06 | Richmount Computers Ltd | Fibre channel diagnostics in a storage enclosure |
US7216188B2 (en) * | 2003-03-29 | 2007-05-08 | Emc Corporation | Techniques for accessing devices through a set of serial buses automatically setting unique enclosure addresses and detecting non-unique enclosure addresses upon initialization |
US6832168B2 (en) * | 2003-04-04 | 2004-12-14 | Hewlett-Packard Development Company, L.P. | Method and system for verifying network device power cabling configuration |
US20050028028A1 (en) * | 2003-07-29 | 2005-02-03 | Jibbe Mahmoud K. | Method for establishing a redundant array controller module in a storage array network |
GB0320388D0 (en) * | 2003-08-30 | 2003-10-01 | Ibm | Method and apparatus for improved error avoidance in a redundant data path system |
US20060104206A1 (en) * | 2004-11-18 | 2006-05-18 | Bomhoff Matthew D | Apparatus, system, and method for detecting a fibre channel miscabling event |
US7793145B2 (en) * | 2006-11-06 | 2010-09-07 | Dot Hill Systems Corporation | Method and apparatus for verifying fault tolerant configuration |
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EP0415546A2 (en) * | 1989-08-01 | 1991-03-06 | Digital Equipment Corporation | Memory device |
US5875242A (en) * | 1996-07-26 | 1999-02-23 | Glaser; Lawrence F. | Telecommunications installation and management system and method |
EP0989490A2 (en) * | 1998-09-25 | 2000-03-29 | Ncr International Inc. | Protocol for dynamic binding of shared resources |
US6058455A (en) * | 1997-07-02 | 2000-05-02 | International Business Corporation | RAID system having a selectable unattended mode of operation with conditional and hierarchical automatic re-configuration |
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US5586250A (en) * | 1993-11-12 | 1996-12-17 | Conner Peripherals, Inc. | SCSI-coupled module for monitoring and controlling SCSI-coupled raid bank and bank environment |
US5619642A (en) | 1994-12-23 | 1997-04-08 | Emc Corporation | Fault tolerant memory system which utilizes data from a shadow memory device upon the detection of erroneous data in a main memory device |
US5890214A (en) | 1996-02-27 | 1999-03-30 | Data General Corporation | Dynamically upgradeable disk array chassis and method for dynamically upgrading a data storage system utilizing a selectively switchable shunt |
US6076142A (en) * | 1996-03-15 | 2000-06-13 | Ampex Corporation | User configurable raid system with multiple data bus segments and removable electrical bridges |
US6047353A (en) | 1997-05-07 | 2000-04-04 | Emc Corporation | Method and apparatus for monitoring of host activities relating to an attached storage device |
US6192481B1 (en) * | 1998-08-18 | 2001-02-20 | International Business Machines Corporation | Structure and method for power sequencing of disk drives in a computer system |
US6192027B1 (en) * | 1998-09-04 | 2001-02-20 | International Business Machines Corporation | Apparatus, system, and method for dual-active fibre channel loop resiliency during controller failure |
-
2000
- 2000-05-24 US US09/578,830 patent/US6351831B1/en not_active Expired - Lifetime
-
2001
- 2001-04-16 CA CA002409925A patent/CA2409925A1/en not_active Abandoned
- 2001-04-16 EP EP01927039A patent/EP1301971A4/en not_active Withdrawn
- 2001-04-16 WO PCT/US2001/012297 patent/WO2001091263A1/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0415546A2 (en) * | 1989-08-01 | 1991-03-06 | Digital Equipment Corporation | Memory device |
US5875242A (en) * | 1996-07-26 | 1999-02-23 | Glaser; Lawrence F. | Telecommunications installation and management system and method |
US6058455A (en) * | 1997-07-02 | 2000-05-02 | International Business Corporation | RAID system having a selectable unattended mode of operation with conditional and hierarchical automatic re-configuration |
EP0989490A2 (en) * | 1998-09-25 | 2000-03-29 | Ncr International Inc. | Protocol for dynamic binding of shared resources |
Non-Patent Citations (1)
Title |
---|
See also references of WO0191263A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001091263A1 (en) | 2001-11-29 |
US6351831B1 (en) | 2002-02-26 |
WO2001091263A9 (en) | 2003-01-03 |
CA2409925A1 (en) | 2001-11-29 |
EP1301971A1 (en) | 2003-04-16 |
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